🇮🇸The Blue Lagoon is a year-round spa in Iceland. Entrance ticket for adults (14+) - from 6990 ISK (Icelandic kroner).

The Blue lagoon is a large lake with an ideal temperature for swimming (on average 39°C). It is located on the Reykjavik Peninsula in the south-west of Iceland, a 15-minute drive from Keflavik International Airport and about 30 minutes from the capital, Reykjavik. It turns out that this is an ideal place to stop on arrival or departure from the country.
https://goo.gl/maps/pgruvKwnsx3My9Pr7